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What Readers Are Saying About

Programming Cocoa with Ruby

This isn’t just a book on RubyCocoa; it is probably the best book I’ve

seen that explains Cocoa technology. It actually explains how some of

the core technologies, especially bindings, work instead of just show-

ing an example of how to use them.

Allison Newman

Cocoa application developer

Learning a new API is hard enough, but learning a new API and a new

programming language at the same time can be overwhelming. Pro-

gramming Cocoa with Ruby is written for those of us used to a lan-

guage like Ruby or Python who want to learn about all the great stuff

Cocoa has to offer.

Jeremy McAnally

Developer, entp

The inﬂuence of Smalltalk on Ruby and Objective-C is considerable.

It shouldn’t be a surprise then that Cocoa, whose native tongue is

Objective-C, can be effectively learned and programmed from Ruby

in a way that captures the succinctness and expressiveness of this

newly popular scripting language. Brian’s book is a great introduc-

tion to the agile development of Cocoa apps, it serves as a primer on

Cocoa, and it demonstrates sound and thoughtful development prac-

tices and hygiene throughout.

Jerry Kuch

Principal engineer, EMC Corporation

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Programming Cocoa with Ruby

Create Compelling Mac Apps Using RubyCocoa

Brian Marick

The Pragmatic Bookshelf

Raleigh, North Carolina

Dallas, Texas

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Many of the designations used by manufacturers and sellers to distinguish their prod-

ucts are claimed as trademarks. Where those designations appear in this book, and The

Pragmatic Programmers, LLC was aware of a trademark claim, the designations have

been printed in initial capital letters or in all capitals. The Pragmatic Starter Kit, The

Pragmatic Programmer, Pragmatic Programming, Pragmatic Bookshelf and the linking g

device are trademarks of The Pragmatic Programmers, LLC.

Every precaution was taken in the preparation of this book. However, the publisher

assumes no responsibility for errors or omissions, or for damages that may result from

the use of information (including program listings) contained herein.

Our Pragmatic courses, workshops, and other products can help you and your team

create better software and have more fun. For more information, as well as the latest

Pragmatic titles, please visit us at

http://www.pragprog.com

Copyright © 2009 Brian Marick.

All rights reserved.

No part of this publication may be reproduced, stored in a retrieval system, or transmit-

ted, in any form, or by any means, electronic, mechanical, photocopying, recording, or

otherwise, without the prior consent of the publisher.

Printed in the United States of America.

ISBN-10: 1-934356-19-0

ISBN-13: 978-1-934356-19-7

Printed on acid-free paper.

P1.0 printing, July 2009

Version: 2009-8-6

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Contents

1

Introduction

11

1.1

What Is Cocoa?

. . . . . . . . . . . . . . . . . . . . . . .

12

1.2

What Is RubyCocoa?

. . . . . . . . . . . . . . . . . . . .

12

1.3

What’s It Like to Learn Cocoa Using Ruby? . . . . . . .

12

1.4

RubyCocoa? That’s So Last Year! . . . . . . . . . . . . .

13

1.5

Prerequisites . . . . . . . . . . . . . . . . . . . . . . . . .

13

1.6

Versions

. . . . . . . . . . . . . . . . . . . . . . . . . . .

15

1.7

Our Example App . . . . . . . . . . . . . . . . . . . . . .

16

1.8

Centuries of the Bookmaker’s Art: Scorned . . . . . . .

18

1.9

Some Terminology

. . . . . . . . . . . . . . . . . . . . .

19

1.10

Service After the Sale . . . . . . . . . . . . . . . . . . . .

19

1.11

Solving Problems

. . . . . . . . . . . . . . . . . . . . . .

19

1.12

Acknowledgments . . . . . . . . . . . . . . . . . . . . . .

20

2

How Do We Get This Thing Started?

22

2.1

A Program That Prints

. . . . . . . . . . . . . . . . . . .

23

2.2

Putting an Item in the Status Bar

. . . . . . . . . . . .

26

2.3

Menus

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

27

2.4

An Application Bundle

. . . . . . . . . . . . . . . . . . .

31

2.5

What Now? . . . . . . . . . . . . . . . . . . . . . . . . . .

35

I

A First Realistic App

36

3

Working with Interface Builder and Xcode

37

3.1

The Basics . . . . . . . . . . . . . . . . . . . . . . . . . .

38

3.2

Creating and Editing Classes in Xcode . . . . . . . . . .

48

3.3

Debugging

. . . . . . . . . . . . . . . . . . . . . . . . . .

55

3.4

Synchronizing Interface Builder and Xcode . . . . . . .

57

3.5

Attributes

. . . . . . . . . . . . . . . . . . . . . . . . . .

58

3.6

Overriding Window Behavior with a Delegate . . . . . .

60

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